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本文提出了应用于流场光学诊断的使用光偏振相移的数字剪切散斑干涉技术。它具有如下两个显著的优点。首先,产生干涉效应的两相干光束均是物光束。它们通过几乎相同的光学元件与几何空间。这样可以降低测量过程中对环境的防震要求,便于工程中的实际应用。其二,采用光偏振相移方法来获取干涉图上的位相信息,与通常使用的压电陶瓷(PZT)相移方法相比,不需要复杂的标定,使用更为方便。本文详细介绍了该技术的实验装置、基本原理以及对于二维流场与轴对称流场的实验数据处理方法,并给出了利用该技术获得的光学显示图象。
In this paper, digital shear speckle interferometry using optical polarization phase shift is proposed for optical diagnosis of flow field. It has the following two significant advantages. First, both coherent beams that create the interference effect are object beams. They pass almost the same optical element and geometry space. This can reduce the shockproof requirements of the environment in the measurement process and is convenient for the practical application in the project. Second, the polarization phase shift method is used to obtain the phase information on the interferogram. Compared with the commonly used PZT phase shift method, it is more convenient to use without complicated calibration. In this paper, the experimental setup, basic principles, experimental data processing methods for two-dimensional flow field and axisymmetric flow field are introduced in detail, and the optical display images obtained by this technique are given.